The Genesis And Prospeting Potentail Of Shirenzhai Gold Deposit In Southern Daibie Mountains

Tongbai-Dabieshan region,the eastern extension of the Qinling composite orogenic belt,is located between the North China block and the Yangtze block. On the basis of Tongbai-Shangcheng and Xincheng-Xishui primary shear zone, parallel to the orogenic belt can be divided into three block: North Huaiyang 、 Tongbai-Dabie orogenic belt( Dabie Mountains) and Suizhou-Susong-Zhangbaling. There are more than a dozen large and medium-sized gold(silver)deposits in this area.The study area(Shirenzhai) is located in the southern margin of the Dabie Mountains,the tectonic position is in the northern margin of the triangle fracture zone,which is formed by the Tanlu fault belt and the Xiangfan-Guangji fault zone.Gold deposits(points)distribution in the region,and the scale is small.This paper based on the latest achievements of 1:10000 regional geology minerals investigation in Qichun Shirenzhai in 2014.Based on a brief analysis of regional geological and metallogenic background,through the study of geology,fluid inclusions of Shirenzhai gold deposit,geochemical features and compared the typical metallogenic characteristics of gold deposit in this region,to determine the ore controlling factors and characteristics,define the properties of ore-forming fluid. This paper also discussed the source of ore-forming materials and the genesis of the deposit,and initially established a metallogenic model.Through the analysis of the geological and Chemical exploration achievements in this area,summarize the regional enrichment regularity of gold element and determined the mineralized prospecting area.The mainly achievement as follows:1.Confirmed the characters of the two(Liuhe and Lianhua)important structure shear zone in the study area.Discovered the occurrence of rock mass, rocks vein,quartz vein and ore bodies are mainly in accordance with the shear zone in this district.It is indicated that the shear zone is the main factor to control rock mass and the gold deposits in the area.2.Through the research on the distribution,scale and characteristics of deformation of shear zone in the Shirenzhai area, thought of the shear zone overall take the crisp-tough deformation.According to the deformation fabric of the intersection,interpenetration and superimposed compound relations and its geometry and kinematics characteristics,combinedwith the regional geological evolution history, to divide the stages of each shear zone structure and discuss the controlling mechanism to gold ore.3.The mineralization of Shirenzhai gold deposit can be divided into the following stages:Pyrite-Quartz stage, Quartz-Polymetallic sulfide stage and Carbonate-Barite stage, the second stage is the main period of the formation of the Au.Combined with the results of previous studies,these shows that the ore-forming materials comes from the fluid extraction of the surrounding rock and deep substance. The ore-forming fluid belongs to CO2-H2O±N2±H2±CH4 system, its property belonging to the multi formation, which is composed of metamorphic water and magmatic thermal fluid mixing.4.By comparing and analyzing the tectonic background,geological characteristics of the deposit and ore-forming fluid properties of the typical gold deposits in the Dabieshan area,indicates that the Shirenzhai gold deposit is the mediμm-superficial depth and hydrothermal quartz vein-gold deposit,similar with the characteristics of extensional orogenic gold deposit.5.According to the research on the Shirenzhai gold deposit of geological characteristics ore and controlling factors in this paper,combined with the geologic and geochemical data,determined Majiawan is the mineralize prospective area.